Across
- 3. substance that has a pH less than 7 when it is in aqueous solution
- 5. (atomic) central core in an atom, composed of protons and neutrons.
- 6. describes a substance with a pH of 7 when in aqueous solution
- 10. measure of the average mass of an atom of an element
- 12. member of the family of non-metal gases that are colorless, odorless, and unreactive
- 15. the outermost electrons of an atom, which are located in electron shells
- 16. one of the states of matter, where the molecules are packed close together
- 17. new substance formed during a chemical reaction
- 18. subatomic particle that has a positive chrge of 1+
- 19. a solid that is packed with ions, molecules or atoms in an orderly fashion
- 20. combination of pure substances
Down
- 1. a molecule that has gained or lost one or more electrons
- 2. chemical reaction between an acid and a base that produces water and a salt
- 4. material that allows electric flow more freely
- 7. number of protons in an atom of an element
- 8. when a substance is below the critical temperature while in the gas phase
- 9. subatomic particle that is neutral
- 11. substance that has a pH of greater than 7 when it is in aqueous solution
- 13. group 1 on the periodic table
- 14. illustration of an atom that shows the arrangement and number of electrons in each shell
- 18. horizontal row of the periodic table